Flathead Lake is the largest natural freshwater lake in the western U.S., and it is also one of the cleanest lakes in the world. Flathead Lake Montana, offers Big Arm, Finley Point, Flathead Lake Islands, Wayfarers, and West Shore, and much more. You can do a lot of outdoor activities like biking, boating, river recreation, camping, hiking, off-road riding, snowmobiling, and shooting. Tips while visiting this place are to bring essential items like sunscreen, water, and comfortable shoes for the activities. People should carry cash while visiting this place, as small stores and markets do not accept credit cards.